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P2443 OBD-II Trouble Code: Secondary Air Injection System Switching Valve Stuck Closed Bank 2

Check Engine Light

P2443 code definition

Secondary Air Injection System Switching Valve Stuck Closed Bank 2

What the P2443 code means

P2443 is an OBD-II generic code for the engine control module (ECM) detecting the exhaust pressure sensor is detecting no exhaust pulse when the bank 2 switching valve is commanded to be open while the engine is running.

What causes the P2443 code?

  • The engine control module (ECM) monitors the exhaust pressure sensors to determine if the air injection system is operating correctly when it commands the switching valve open and closed.

  • The code is set when the air injection system switching valve is commanded open and the sensor is detecting no exhaust pulse indicating the valve is stuck closed or the sensor is defective.

What are the symptoms of the P2443 code?

  • The Check Engine Light will be illuminated and the code is set in the ECM memory as a fault.

  • The vehicle will not run any different in most cases.

  • The vehicle will fail emission testing.

How does a mechanic diagnose the P2443 code?

  • Scans for codes and documents the code in the ECM and looks at the freeze frame data for the problem before clearing the codes and retesting

  • Clears the codes and retests to verify the code returns and two drive cycles

  • Tests the resistance of the switching valve and check as per specifications

  • Tests wiring for shorts between power supply and the pressure sensor

  • Tests the pressure sensor for proper resistance

Common mistakes when diagnosing the P2443 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired

  • Failing to clear the ECM codes after the codes are fixed

  • Failing to verify the failure before attempting testing and repairs

How serious is the P2443 code?

Code P2443 is an indication that the air injection system switching valve is not working or a sensor problem that will cause no drive symptoms. The exhaust emissions will be affected and will cause the vehicle to fail emission testing.

What repairs can fix the P2443 code?

  • Replacing the air control valve for the secondary air injection system
  • Replacing the exhaust pressure sensor to the secondary air injection system
  • Repairing wiring or connections to the air injection system and directed by pinpoint tests

Additional comments for consideration regarding the P2443 code

Code P2443 is for the secondary air injection switching valve stuck closed and the exhaust may have melted the valve causing it to stick closed. Make sure you correct any engine lean condition that could be the reason the exhaust is getting hotter than normal. Correct all codes retrieved.

Need help with a P2443 code?

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The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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